Finding the Fourth Proportional to 1,290.26, 1,780.55 and 792.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.26 : 1,780.55 = 792.72 : x
2. Step 2: Convert to fraction form
   1,290.26/1,780.55 = 792.72/x
3. Step 3: Cross multiply
   1,290.26x = 1,780.55 × 792.72
4. Step 4: Simplify right side
   1,290.26x = 1,411,476.61
5. Step 5: Solve for x
   x = 1,411,476.61/1,290.26
6. Step 6: Final answer
   x = 1,093.95